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There's tech we know exists, like smartphones. And there's tech that will never exist, like teleportation (sorry). But between them, there's the tech that is so close to existing but seems perpetually "a few years away."
Consider the air taxi. This technology—small flying crafts meant to fly within cities, or from cities to the suburbs—has had companies like Uber drooling for years. They've partnered with Hyundai to make this model come to life.